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Segment Information (Details 1) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 3 Months Ended 12 Months Ended
Sep. 16, 2014
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]                        
Total revenue   $ 147,810us-gaap_RealEstateRevenueNet $ 146,558us-gaap_RealEstateRevenueNet $ 150,500us-gaap_RealEstateRevenueNet $ 152,114us-gaap_RealEstateRevenueNet $ 138,658us-gaap_RealEstateRevenueNet $ 143,354us-gaap_RealEstateRevenueNet $ 140,664us-gaap_RealEstateRevenueNet $ 139,554us-gaap_RealEstateRevenueNet $ 596,982us-gaap_RealEstateRevenueNet $ 562,210us-gaap_RealEstateRevenueNet $ 535,679us-gaap_RealEstateRevenueNet
Reconciliation of consolidated net operating income                        
Consolidated net operating income                   361,017us-gaap_GrossProfit 340,441us-gaap_GrossProfit 324,831us-gaap_GrossProfit
Less:                        
Interest expense                   (124,329)us-gaap_InterestExpenseDebt (121,937)us-gaap_InterestExpenseDebt (132,939)us-gaap_InterestExpenseDebt
Interest expense - amortization of deferred financing costs                   (5,148)us-gaap_AmortizationOfFinancingCosts (4,676)us-gaap_AmortizationOfFinancingCosts (6,208)us-gaap_AmortizationOfFinancingCosts
Interest expense — financing obligation                   (1,144)us-gaap_InterestExpenseOther (972)us-gaap_InterestExpenseOther (850)us-gaap_InterestExpenseOther
Depreciation and amortization                   (208,569)us-gaap_DepreciationAndAmortization (197,021)us-gaap_DepreciationAndAmortization (188,382)us-gaap_DepreciationAndAmortization
Administrative expenses                   (26,779)us-gaap_GeneralAndAdministrativeExpense (27,628)us-gaap_GeneralAndAdministrativeExpense (25,413)us-gaap_GeneralAndAdministrativeExpense
Plus:                        
Interest Income                   3,974us-gaap_InterestIncomeOther 1,044us-gaap_InterestIncomeOther 3,008us-gaap_InterestIncomeOther
Historic tax credit transaction income                   11,853us-gaap_IncomeTaxCreditsAndAdjustments 11,853us-gaap_IncomeTaxCreditsAndAdjustments 11,840us-gaap_IncomeTaxCreditsAndAdjustments
Recognized hedge activity (800)us-gaap_DerivativeGainLossOnDerivativeNet                 (828)us-gaap_DerivativeGainLossOnDerivativeNet 0us-gaap_DerivativeGainLossOnDerivativeNet (2,985)us-gaap_DerivativeGainLossOnDerivativeNet
Equity in income (loss) of real estate ventures                   (790)us-gaap_IncomeLossFromEquityMethodInvestments 3,664us-gaap_IncomeLossFromEquityMethodInvestments 2,741us-gaap_IncomeLossFromEquityMethodInvestments
Net gain (loss) on sale of undepreciated real estate                   458us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain 6,866us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain 0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
Net gain from remeasurement of investments in real estate ventures                   4,901us-gaap_GainsLossesOnSalesOfInvestmentRealEstate 0us-gaap_GainsLossesOnSalesOfInvestmentRealEstate 0us-gaap_GainsLossesOnSalesOfInvestmentRealEstate
Net gain (loss) on sale of undepreciated real estate                   1,184bdn_Netgainlossonsaleofundepreciatedrealestate (137)bdn_Netgainlossonsaleofundepreciatedrealestate 0bdn_Netgainlossonsaleofundepreciatedrealestate
Net gain (loss) on real estate venture transactions                   (417)bdn_NetGainLossOnRealEstateVentureTransactions 29,604bdn_NetGainLossOnRealEstateVentureTransactions (950)bdn_NetGainLossOnRealEstateVentureTransactions
Provision for impairment on assets held for sale                   (1,765)us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf 0us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf 0us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Gain (loss) on early extinguishment of debt (2,606)us-gaap_GainsLossesOnExtinguishmentOfDebt                 (7,594)us-gaap_GainsLossesOnExtinguishmentOfDebt (2,119)us-gaap_GainsLossesOnExtinguishmentOfDebt (22,002)us-gaap_GainsLossesOnExtinguishmentOfDebt
Income (loss) from continuing operations                   6,024us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 38,982us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (37,309)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income from discontinued operations                   918us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 4,207us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 43,838us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income (loss)   (1,869)us-gaap_ProfitLoss 8,882us-gaap_ProfitLoss 2,174us-gaap_ProfitLoss (2,245)us-gaap_ProfitLoss 21,002us-gaap_ProfitLoss 11,088us-gaap_ProfitLoss 7,180us-gaap_ProfitLoss 3,919us-gaap_ProfitLoss 6,942us-gaap_ProfitLoss 43,189us-gaap_ProfitLoss 6,529us-gaap_ProfitLoss
Philadelphia CBD [Member]                        
Segment Reporting Information [Line Items]                        
Total revenue                   201,809us-gaap_RealEstateRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_PhiladelphiaCbdMember
146,081us-gaap_RealEstateRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_PhiladelphiaCbdMember
131,592us-gaap_RealEstateRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_PhiladelphiaCbdMember
Reconciliation of consolidated net operating income                        
Consolidated net operating income                   126,547us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_PhiladelphiaCbdMember
90,379us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_PhiladelphiaCbdMember
80,805us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_PhiladelphiaCbdMember
Plus:                        
Equity in income (loss) of real estate ventures                   46us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_PhiladelphiaCbdMember
1,547us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_PhiladelphiaCbdMember
1,113us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_PhiladelphiaCbdMember
New Jersey/ Delaware [Member]                        
Segment Reporting Information [Line Items]                        
Total revenue                   60,403us-gaap_RealEstateRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_NewJerseyDelawareMember
60,262us-gaap_RealEstateRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_NewJerseyDelawareMember
59,671us-gaap_RealEstateRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_NewJerseyDelawareMember
Reconciliation of consolidated net operating income                        
Consolidated net operating income                   28,753us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_NewJerseyDelawareMember
30,281us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_NewJerseyDelawareMember
31,165us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_NewJerseyDelawareMember
Plus:                        
Equity in income (loss) of real estate ventures                   989us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_NewJerseyDelawareMember
1,245us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_NewJerseyDelawareMember
1,803us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_NewJerseyDelawareMember
Richmond, Virginia [Member]                        
Segment Reporting Information [Line Items]                        
Total revenue                   34,180us-gaap_RealEstateRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_RichmondVirginiaMember
35,058us-gaap_RealEstateRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_RichmondVirginiaMember
35,701us-gaap_RealEstateRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_RichmondVirginiaMember
Reconciliation of consolidated net operating income                        
Consolidated net operating income                   18,781us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_RichmondVirginiaMember
20,142us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_RichmondVirginiaMember
21,217us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_RichmondVirginiaMember
Plus:                        
Equity in income (loss) of real estate ventures                   349us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_RichmondVirginiaMember
381us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_RichmondVirginiaMember
269us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_RichmondVirginiaMember
Austin, Texas [Member]                        
Segment Reporting Information [Line Items]                        
Total revenue                   5,610us-gaap_RealEstateRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_AustinTexasMember
31,451us-gaap_RealEstateRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_AustinTexasMember
32,379us-gaap_RealEstateRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_AustinTexasMember
Reconciliation of consolidated net operating income                        
Consolidated net operating income                   2,387us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_AustinTexasMember
18,153us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_AustinTexasMember
18,428us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_AustinTexasMember
Plus:                        
Equity in income (loss) of real estate ventures                   $ (1,080)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_AustinTexasMember
$ (564)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_AustinTexasMember
$ (316)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_AustinTexasMember